We did some recalls, and he put his whole heart into it, as if he was racing someone.
I have since learned that his first owner used aversive methods to train dogs. I can see how R might shut down when faced with that kind of training. At his core, he's a very sensitive soul.
It took me a long time to get to know his sensitive side. He's so driven most of the time that you'd never guess that he had such a soft heart.